Nginx ("engine x") 是一個高性能的 HTTP 和
反向代理 服務器，也是一個 IMAP/POP3/SMTP
代理服務器 。 Nginx 是由
Igor Sysoev 為俄羅斯訪問量第二的
Rambler.ru 站點開發的，它已經在該站點運行超過四年多了。Igor 將源代碼以類BSD許可證的形式發布。自Nginx 發布四年來，Nginx 已經因為它的穩定性、豐富的功能集、
示例配置文件和低系統資源的消耗而聞名了。目前國內各大門戶網站已經部署了Nginx，如新浪、網易、騰訊等；國內幾個重要的視頻分享網站也部署了Nginx，如六房間、酷6等。
新近發現Nginx 技術在國內日趨火熱，越來越多的網站開始部署Nginx。
這么好的東西不用用不行啊，，，來看官方的文檔。
NginxChsHttpUpstreamModule
Edit section: 摘要 摘要
這個模塊提供一個簡單方法來實現在輪詢和客戶端IP之間的后端服務器負荷平衡。
配置范例：
upstream backend {
server backend1.example.com weight=5;
server backend2.example.com:8080;
server unix:/tmp/backend3;
}
server {
location / {
proxy_pass http://backend;
}
}
配置指導
Edit section: ip_hash ip_hash
syntax: ip_hash
default: none
context: upstream
This directive causes requests to be distributed between upstreams based on the IP-address of the client. The key for the hash is the class-C network address of the client. This method guarantees that the client request will always be transferred to the same server. But if this server is considered inoperative, then the request of this client will be transferred to another server. This gives a high probability clients will always connect to the same server.
范例：
upstream backend {
ip_hash;
server backend1.example.com;
server backend2.example.com;
server backend3.example.com down;
server backend4.example.com;
}
Edit section: server server
syntax: server name [parameters]
default: none
context: upstream
看不出名堂？不要緊看我的 配置最直觀 nginx.conf
#user nobody;
worker_processes 1;
#error_log logs/error.log;
#error_log logs/error.log notice;
#error_log logs/error.log info;
#pid logs/nginx.pid;
events {
worker_connections 1024;
}
http {
include mime.types;
default_type application/octet-stream;
#log_format main '$remote_addr - $remote_user [$time_local] "$request" '
# '$status $body_bytes_sent "$http_referer" '
# '"$http_user_agent" "$http_x_forwarded_for"';
#access_log logs/access.log main;
upstream vanlin.imblog.in {
server 127.0.0.1:8080;
#這里才是實現均衡的地方，一般做法 Nginx 對外， 內部對應多臺 server 有點像映射。。。
}
sendfile on;
#tcp_nopush on;
#keepalive_timeout 0;
keepalive_timeout 65;
#gzip on;
server {
listen 80;
server_name vanlin.imblog.in;
#charset koi8-r;
#access_log logs/host.access.log main;
location / {
proxy_pass http://vanlin.imblog.in;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
}
#error_page 404 /404.html;
# redirect server error pages to the static page /50x.html
#
error_page 500 502 503 504 /50x.html;
location = /50x.html {
root html;
}
#這里配置過php，，好像。。 需要 php_cgi 的支持
# proxy the PHP scripts to Apache listening on 127.0.0.1:80
#
#location ~ \.php$ {
# proxy_pass http://127.0.0.1;
#}
# pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
#
#location ~ \.php$ {
# root html;
# fastcgi_pass 127.0.0.1:9000;
# fastcgi_index index.php;
# fastcgi_param SCRIPT_FILENAME /scripts$fastcgi_script_name;
# include fastcgi_params;
#}
# deny access to .htaccess files, if Apache's document root
# concurs with nginx's one
#
#location ~ /\.ht {
# deny all;
#}
}
# another virtual host using mix of IP-, name-, and port-based configuration
#
#server {
# listen 8000;
# listen somename:8080;
# server_name somename alias another.alias;
# location / {
# root html;
# index index.html index.htm;
# }
#}
# HTTPS server
#
#server {
# listen 443;
# server_name localhost;
# ssl on;
# ssl_certificate cert.pem;
# ssl_certificate_key cert.key;
# ssl_session_timeout 5m;
# ssl_protocols SSLv2 SSLv3 TLSv1;
# ssl_ciphers ALL:!ADH:!EXPORT56:RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSLv2:+EXP;
# ssl_prefer_server_ciphers on;
# location / {
# root html;
# index index.html index.htm;
# }
#}
}